CVE-2020-36244
📋 TL;DR
CVE-2020-36244 is a critical heap-based buffer overflow vulnerability in GENIVI diagnostic log and trace (DLT) daemon that allows remote attackers to execute arbitrary code. This affects DLT-Daemon versions prior to 2.18.6. Systems using vulnerable versions of the DLT daemon for automotive or embedded logging are at risk.
💻 Affected Systems
- GENIVI diagnostic log and trace (DLT) daemon
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution with full system compromise, allowing attacker to take complete control of affected systems, potentially leading to data theft, system disruption, or lateral movement within networks.
Likely Case
Remote code execution leading to system compromise, service disruption, and potential data exfiltration from automotive or embedded systems.
If Mitigated
Denial of service if exploit fails or is blocked by network segmentation, with potential service disruption but no code execution.
🎯 Exploit Status
The vulnerability allows remote exploitation without authentication. While no public proof-of-concept exists, the heap overflow nature makes exploitation feasible for skilled attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.18.6
Vendor Advisory: https://github.com/GENIVI/dlt-daemon/compare/v2.18.5...v2.18.6
Restart Required: Yes
Instructions:
1. Download DLT-Daemon version 2.18.6 or later from official repository. 2. Stop the DLT daemon service. 3. Install the updated version. 4. Restart the DLT daemon service.
🔧 Temporary Workarounds
Network Segmentation
linuxRestrict network access to DLT daemon ports to trusted systems only
iptables -A INPUT -p tcp --dport <DLT_PORT> -s <TRUSTED_IP> -j ACCEPT
iptables -A INPUT -p tcp --dport <DLT_PORT> -j DROP
Service Disablement
linuxTemporarily disable DLT daemon if not essential
systemctl stop dlt-daemon
systemctl disable dlt-daemon
🧯 If You Can't Patch
- Implement strict network segmentation to isolate DLT daemon from untrusted networks
- Deploy intrusion detection/prevention systems to monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check DLT daemon version: dlt-daemon --version or check installed package versionCheck Version:
dlt-daemon --versionVerify Fix Applied:
Verify version is 2.18.6 or later: dlt-daemon --version | grep -q '2.18.[6-9]\|2.[19-9]'📡 Detection & Monitoring
Log Indicators:
- Abnormal DLT daemon crashes or restarts
- Unusual network connections to DLT daemon port
- Memory allocation errors in system logs
Network Indicators:
- Unexpected traffic to DLT daemon default port (3490)
- Malformed packets targeting DLT service
SIEM Query:
source="dlt-daemon" AND (event_type="crash" OR event_type="error") OR destination_port=3490 AND protocol="TCP" AND NOT source_ip IN (trusted_ips)🔗 References
- https://github.com/GENIVI/dlt-daemon/compare/v2.18.5...v2.18.6
- https://github.com/GENIVI/dlt-daemon/issues/265
- https://lists.debian.org/debian-lts-announce/2022/12/msg00016.html
- https://us-cert.cisa.gov/ics/advisories/icsa-21-147-01
- https://github.com/GENIVI/dlt-daemon/compare/v2.18.5...v2.18.6
- https://github.com/GENIVI/dlt-daemon/issues/265
- https://lists.debian.org/debian-lts-announce/2022/12/msg00016.html
- https://us-cert.cisa.gov/ics/advisories/icsa-21-147-01
